Kristin platform

thingiverse

I originally created this for the Make It Float challenge, but I decided to give it a try here as well. I'm currently away and unable to print anything before I get home. If you do end up printing this and find some faults, please let me know and I'll try to fix them. ##**STL file of the platform is for viewing purposes only!** **About** The semi-submersible coin rig was inspired by the Kristin platform. Kristin is a semi-submersible oil rig located in the Norwegian Sea. **The Science** I made this model to demonstrate how the semi-submersible rig's main principles work. A semi-submersible rig is often preferred over a vessel due to its stability. This lies in the pontoons, where the rig gets most of its buoyancy from, which are submerged. Only four feet stick out of the water, decreasing the area affected by waves compared to a vessel and making the rig more stable in rough weather. It's essential for the rig to lie level in the water. Due to different equipment being placed at various locations, the rig will have a weight imbalance. The rig has big tanks in its hull that are filled or drained with sea water to compensate for this weight imbalance. To make the rig stable, the center of gravity (CG) needs to be centered and as low as possible. **Use** After printing out the rig, print out the containers you want, place them somewhere on the deck, and fill them with coins. The square taps will keep them in place. The CG will likely be off-balance. You'll need to ballast the rig by adding or removing coins from the tanks in the hull to make it lie level on the water. To access the ballast tanks, you'll need to lift off the main and lower deck. It's also possible to add coins to the lower deck. Experiment with how you can make the coin rig as stable as possible. How much can you add, and where should you place it? The crane, upper torch, lifeboats, and helideck are not necessary. To save print time, you can exclude them. I added them just for fun. **Note** I've included several informative pictures. **Source:** Picture of Kristin platform - http://www.tu.no/migration_catalog/2006/04/25/kristin-plattformen0604251333.jpg